From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Peter Xu <peterx@redhat.com>,
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Matthew Wilcox <willy@infradead.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Andrew Morton <akpm@linux-foundation.org>,
"x86@kernel.org" <x86@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf()
Date: Wed, 20 Mar 2024 17:40:39 +0000 [thread overview]
Message-ID: <2e632389-eb4e-42af-adee-36d5ba6c3d0f@csgroup.eu> (raw)
In-Reply-To: <ZfsKIResY4YcxkxK@x1n>
Le 20/03/2024 à 17:09, Peter Xu a écrit :
> On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote:
>> At the first place that was to get a close fit between hardware
>> pagetable topology and linux pagetable topology. But obviously we
>> already stepped back for 512k pages, so let's go one more step aside and
>> do similar with 8M pages.
>>
>> I'll give it a try and see how it goes.
>
> So you're talking about 8M only for 8xx, am I right?
Yes I am.
>
> There seem to be other PowerPC systems use hugepd. Is it possible that we
> convert all hugepd into cont_pte form?
Indeed.
Seems like we have hugepd for book3s/64 and for nohash.
For book3s I don't know, may Aneesh can answer.
For nohash I think it should be possible because TLB misses are handled
by software. Even the e6500 which has a hardware tablewalk falls back on
software walk when it is a hugepage IIUC.
Christophe
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Peter Xu <peterx@redhat.com>,
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Matthew Wilcox <willy@infradead.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Andrew Morton <akpm@linux-foundation.org>,
"x86@kernel.org" <x86@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf()
Date: Wed, 20 Mar 2024 17:40:39 +0000 [thread overview]
Message-ID: <2e632389-eb4e-42af-adee-36d5ba6c3d0f@csgroup.eu> (raw)
In-Reply-To: <ZfsKIResY4YcxkxK@x1n>
Le 20/03/2024 à 17:09, Peter Xu a écrit :
> On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote:
>> At the first place that was to get a close fit between hardware
>> pagetable topology and linux pagetable topology. But obviously we
>> already stepped back for 512k pages, so let's go one more step aside and
>> do similar with 8M pages.
>>
>> I'll give it a try and see how it goes.
>
> So you're talking about 8M only for 8xx, am I right?
Yes I am.
>
> There seem to be other PowerPC systems use hugepd. Is it possible that we
> convert all hugepd into cont_pte form?
Indeed.
Seems like we have hugepd for book3s/64 and for nohash.
For book3s I don't know, may Aneesh can answer.
For nohash I think it should be possible because TLB misses are handled
by software. Even the e6500 which has a hardware tablewalk falls back on
software walk when it is a hugepage IIUC.
Christophe
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Peter Xu <peterx@redhat.com>,
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Muchun Song <muchun.song@linux.dev>,
"x86@kernel.org" <x86@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Matthew Wilcox <willy@infradead.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Mike Rapoport <rppt@kernel.org>, Jason Gunthorpe <jgg@nvidia.com>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf()
Date: Wed, 20 Mar 2024 17:40:39 +0000 [thread overview]
Message-ID: <2e632389-eb4e-42af-adee-36d5ba6c3d0f@csgroup.eu> (raw)
In-Reply-To: <ZfsKIResY4YcxkxK@x1n>
Le 20/03/2024 à 17:09, Peter Xu a écrit :
> On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote:
>> At the first place that was to get a close fit between hardware
>> pagetable topology and linux pagetable topology. But obviously we
>> already stepped back for 512k pages, so let's go one more step aside and
>> do similar with 8M pages.
>>
>> I'll give it a try and see how it goes.
>
> So you're talking about 8M only for 8xx, am I right?
Yes I am.
>
> There seem to be other PowerPC systems use hugepd. Is it possible that we
> convert all hugepd into cont_pte form?
Indeed.
Seems like we have hugepd for book3s/64 and for nohash.
For book3s I don't know, may Aneesh can answer.
For nohash I think it should be possible because TLB misses are handled
by software. Even the e6500 which has a hardware tablewalk falls back on
software walk when it is a hugepage IIUC.
Christophe
next prev parent reply other threads:[~2024-03-20 17:40 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-13 21:47 [PATCH 00/13] mm/treewide: Remove pXd_huge() API peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 01/13] mm/hmm: Process pud swap entry without pud_huge() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 02/13] mm/gup: Cache p4d in follow_p4d_mask() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 03/13] mm/gup: Check p4d presence before going on peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 04/13] mm/x86: Change pXd_huge() behavior to exclude swap entries peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 05/13] mm/sparc: " peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 06/13] mm/arm: Use macros to define pmd/pud helpers peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 07/13] mm/arm: Redefine pmd_huge() with pmd_leaf() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 08/13] mm/arm64: Merge pXd_huge() and pXd_leaf() definitions peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-14 8:45 ` Christophe Leroy
2024-03-14 8:45 ` Christophe Leroy
2024-03-14 8:45 ` Christophe Leroy
2024-03-14 12:53 ` Peter Xu
2024-03-14 12:53 ` Peter Xu
2024-03-14 12:53 ` Peter Xu
2024-03-14 13:11 ` Christophe Leroy
2024-03-14 13:11 ` Christophe Leroy
2024-03-14 13:11 ` Christophe Leroy
2024-03-18 16:15 ` Jason Gunthorpe
2024-03-18 16:15 ` Jason Gunthorpe
2024-03-18 16:15 ` Jason Gunthorpe
2024-03-19 23:07 ` Christophe Leroy
2024-03-19 23:07 ` Christophe Leroy
2024-03-19 23:07 ` Christophe Leroy
2024-03-19 23:26 ` Jason Gunthorpe
2024-03-19 23:26 ` Jason Gunthorpe
2024-03-19 23:26 ` Jason Gunthorpe
2024-03-20 6:16 ` Christophe Leroy
2024-03-20 6:16 ` Christophe Leroy
2024-03-20 6:16 ` Christophe Leroy
2024-03-20 16:09 ` Peter Xu
2024-03-20 16:09 ` Peter Xu
2024-03-20 16:09 ` Peter Xu
2024-03-20 17:40 ` Christophe Leroy [this message]
2024-03-20 17:40 ` Christophe Leroy
2024-03-20 17:40 ` Christophe Leroy
2024-03-20 20:24 ` Peter Xu
2024-03-20 20:24 ` Peter Xu
2024-03-20 20:24 ` Peter Xu
2024-03-13 21:47 ` [PATCH 10/13] mm/gup: Merge pXd huge mapping checks peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` [PATCH 11/13] mm/treewide: Replace pXd_huge() with pXd_leaf() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-14 8:50 ` Christophe Leroy
2024-03-14 8:50 ` Christophe Leroy
2024-03-14 8:50 ` Christophe Leroy
2024-03-14 12:59 ` Peter Xu
2024-03-14 12:59 ` Peter Xu
2024-03-14 12:59 ` Peter Xu
2024-03-18 16:16 ` Jason Gunthorpe
2024-03-18 16:16 ` Jason Gunthorpe
2024-03-18 16:16 ` Jason Gunthorpe
2024-03-13 21:47 ` [PATCH 12/13] mm/treewide: Remove pXd_huge() peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
2024-03-14 8:56 ` Christophe Leroy
2024-03-14 8:56 ` Christophe Leroy
2024-03-14 8:56 ` Christophe Leroy
2024-03-14 14:08 ` Peter Xu
2024-03-14 14:08 ` Peter Xu
2024-03-14 14:08 ` Peter Xu
2024-03-13 21:47 ` [PATCH 13/13] mm: Document pXd_leaf() API peterx
2024-03-13 21:47 ` peterx
2024-03-13 21:47 ` peterx
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